package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper stmealMapper;

    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        //判断当前商品在购物车中是否已存在
        ShoppingCart cart =new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,cart);
        Long userId = BaseContext.getCurrentId();
        cart.setUserId(userId);
        List<ShoppingCart> list =shoppingCartMapper.list(cart);
        // 如果已经存在，数量+1
        if(list!=null&& !list.isEmpty()){
            ShoppingCart cartService = list.get(0);
            cartService.setNumber(cartService.getNumber()+1);
            shoppingCartMapper.updateNumberById(cartService);
        }else{
        // 否则，添加到购物车，数量默认为1
            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId!=null){
                //添加到购物车的是菜品
                Dish dish = dishMapper.selectbyId(dishId);
                cart.setName(dish.getName());
                cart.setImage(dish.getImage());
                cart.setAmount(dish.getPrice());
            }else {
                //添加到购物车的是套餐
                Setmeal setmeal = stmealMapper.getById(shoppingCartDTO.getSetmealId());
                cart.setName(setmeal.getName());
                cart.setImage(setmeal.getImage());
                cart.setAmount(setmeal.getPrice());
            }
            cart.setCreateTime(LocalDateTime.now());
            cart.setNumber(1);
            shoppingCartMapper.add(cart);
        }



        log.info("添加购物车成功");
    }

    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        return shoppingCartMapper.list(shoppingCart);
    }

    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
        log.info("清空购物车成功");
    }

    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart cart =new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,cart);
        Long userId = BaseContext.getCurrentId();
        cart.setUserId(userId);
        //查询当前菜品或套餐
        List<ShoppingCart> list =shoppingCartMapper.list(cart);
        if(list==null||list.isEmpty()){
            throw new IllegalArgumentException("当前购物车为空，不能删除");
        }
        cart = list.get(0);
        // 如果数量不为1，数量-1
        if (cart.getNumber()>1){
            cart.setNumber(cart.getNumber()-1);
            shoppingCartMapper.updateNumberById(cart);
        }else{
            //如果数量为1，从购物车中删除该菜品或套餐
            shoppingCartMapper.deleteById(cart.getId());
        }
    }
}
